Humm Dinger Double Dinger is the Original Dual Vibrating Pleasure ring designed for His and Her Pleasure! Dual motors stimulate the genital area to create MAXIMUM PLEASURE for both partners! Motors last approximately 40 minutes + and come with batteries included, which are replaceable! There are many other Imitators out there, so don`t be fooled by the rest...be sure to stick with The Best the #1 (ORIGINAL) HUMM DINGER!2 LR44 Batteries Included Features: Prolonged Vibrations - 40+ minutes Strongest Vibrations Satisfying Ticklers For Her Performance Knobs for Him Secure and Simple On/Off Switch Snug Yet Gentle Gel Ring